Can ink in old pens dry out?

Nothing is more frustrating than picking up an ink pen to write a letter and finding that the ink has dried up. Ballpoint pens and rollerball pens can dry out if the cap is left off for extended pe...
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Which came first: gel pens or ballpoint pens?

Ballpoint pens came before gel pens. A primitive version of the ballpoint pen was created in 1888 by John Loud, an American tanner, but it did not receive commercial attention. In the 1940s, Josef ...
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What do sea pens eat?

Sea pens, which are actually colonies of anemone-like polyps working together for the survival of the whole, feed on plankton and organic particles that float by in the water. The individual polyps...
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